package br.com.dwii.tpg2.servlet;

import br.com.dwii.tpg2.util.DBUtil;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Diego
 */
public class ImageServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        byte[] foto = null;
        String contentType = null;
        
        Connection conn = DBUtil.getConnection();
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            ps = conn.prepareStatement("select foto, content_type from animal where id = ?");
            ps.setLong(1, Long.valueOf(request.getParameter("animalId")));
            rs = ps.executeQuery();
            if (rs.next()) {
                foto = rs.getBytes(1);
                contentType = rs.getString(2);
            }
        } catch (SQLException ex) {
            Logger.getLogger(ImageServlet.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            try {
                ps.close();
                rs.close();
                conn.close();
            } catch (SQLException ex) {
                Logger.getLogger(ImageServlet.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        
        response.setContentType(contentType);
        OutputStream out = response.getOutputStream();
        out.write(foto);
        out.flush();
        out.close();
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
